Last change
on this file since 3650 was 3621, checked in by Bruno Cornec, 8 years ago |
New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
|
-
Property svn:eol-style
set to
native
|
File size:
1.4 KB
|
Line | |
---|
1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
4 | */
|
---|
5 |
|
---|
6 | //kbuild:lib-y += percent_decode.o
|
---|
7 |
|
---|
8 | #include "libbb.h"
|
---|
9 |
|
---|
10 | static unsigned hex_to_bin(unsigned char c)
|
---|
11 | {
|
---|
12 | unsigned v;
|
---|
13 |
|
---|
14 | v = c - '0';
|
---|
15 | if (v <= 9)
|
---|
16 | return v;
|
---|
17 | /* c | 0x20: letters to lower case, non-letters
|
---|
18 | * to (potentially different) non-letters */
|
---|
19 | v = (unsigned)(c | 0x20) - 'a';
|
---|
20 | if (v <= 5)
|
---|
21 | return v + 10;
|
---|
22 | return ~0;
|
---|
23 | /* For testing:
|
---|
24 | void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
|
---|
25 | int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
|
---|
26 | t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
|
---|
27 | */
|
---|
28 | }
|
---|
29 |
|
---|
30 | char* FAST_FUNC percent_decode_in_place(char *str, int strict)
|
---|
31 | {
|
---|
32 | /* note that decoded string is always shorter than original */
|
---|
33 | char *src = str;
|
---|
34 | char *dst = str;
|
---|
35 | char c;
|
---|
36 |
|
---|
37 | while ((c = *src++) != '\0') {
|
---|
38 | unsigned v;
|
---|
39 |
|
---|
40 | if (!strict && c == '+') {
|
---|
41 | *dst++ = ' ';
|
---|
42 | continue;
|
---|
43 | }
|
---|
44 | if (c != '%') {
|
---|
45 | *dst++ = c;
|
---|
46 | continue;
|
---|
47 | }
|
---|
48 | v = hex_to_bin(src[0]);
|
---|
49 | if (v > 15) {
|
---|
50 | bad_hex:
|
---|
51 | if (strict)
|
---|
52 | return NULL;
|
---|
53 | *dst++ = '%';
|
---|
54 | continue;
|
---|
55 | }
|
---|
56 | v = (v * 16) | hex_to_bin(src[1]);
|
---|
57 | if (v > 255)
|
---|
58 | goto bad_hex;
|
---|
59 | if (strict && (v == '/' || v == '\0')) {
|
---|
60 | /* caller takes it as indication of invalid
|
---|
61 | * (dangerous wrt exploits) chars */
|
---|
62 | return str + 1;
|
---|
63 | }
|
---|
64 | *dst++ = v;
|
---|
65 | src += 2;
|
---|
66 | }
|
---|
67 | *dst = '\0';
|
---|
68 | return str;
|
---|
69 | }
|
---|
Note:
See
TracBrowser
for help on using the repository browser.